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A037481 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2. +0
5
1, 6, 25, 102, 409, 1638, 6553, 26214, 104857, 419430, 1677721, 6710886, 26843545, 107374182, 429496729, 1717986918, 6871947673, 27487790694, 109951162777, 439804651110, 1759218604441, 7036874417766, 28147497671065 (list; graph; listen)
OFFSET

1,2

FORMULA

((4^n - (-1)^n)/5 - 1)/2. - R. Stephan

CROSSREFS

Cf. A014985, A015521.

Sequence in context: A034347 A009121 A037537 this_sequence A029871 A147543 A048875

Adjacent sequences: A037478 A037479 A037480 this_sequence A037482 A037483 A037484

KEYWORD

nonn,base

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.


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